EP2109910B1 - Brennstoffzelle und fahrzeug mit brennstoffzelle - Google Patents

Brennstoffzelle und fahrzeug mit brennstoffzelle Download PDF

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Publication number
EP2109910B1
EP2109910B1 EP08709757.2A EP08709757A EP2109910B1 EP 2109910 B1 EP2109910 B1 EP 2109910B1 EP 08709757 A EP08709757 A EP 08709757A EP 2109910 B1 EP2109910 B1 EP 2109910B1
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EP
European Patent Office
Prior art keywords
gas
fuel
fuel cell
hydrogen
anode
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
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EP08709757.2A
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English (en)
French (fr)
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EP2109910A1 (de
Inventor
Tomohiro Ogawa
Masaaki Kondo
Kazunori Shibata
Takashi Kajiwara
Tsutomu Shirakawa
Satoshi Futami
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Toyota Motor Corp
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Toyota Motor Corp
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/02—Details
    • H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
    • H01M8/0204—Non-porous and characterised by the material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/02—Details
    • H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
    • H01M8/023—Porous and characterised by the material
    • H01M8/0241—Composites
    • H01M8/0245—Composites in the form of layered or coated products
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/02—Details
    • H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
    • H01M8/0258—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/02—Details
    • H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
    • H01M8/0267—Collectors; Separators, e.g. bipolar separators; Interconnectors having heating or cooling means, e.g. heaters or coolant flow channels
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
    • H01M8/04082—Arrangements for control of reactant parameters, e.g. pressure or concentration
    • H01M8/04089—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/24—Grouping of fuel cells, e.g. stacking of fuel cells
    • H01M8/241—Grouping of fuel cells, e.g. stacking of fuel cells with solid or matrix-supported electrolytes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/24—Grouping of fuel cells, e.g. stacking of fuel cells
    • H01M8/2457—Grouping of fuel cells, e.g. stacking of fuel cells with both reactants being gaseous or vaporised
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/24—Grouping of fuel cells, e.g. stacking of fuel cells
    • H01M8/2465—Details of groupings of fuel cells
    • H01M8/2483—Details of groupings of fuel cells characterised by internal manifolds
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
    • H01M4/8605—Porous electrodes
    • H01M4/861—Porous electrodes with a gradient in the porosity
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
    • H01M4/8636—Inert electrodes with catalytic activity, e.g. for fuel cells with a gradient in another property than porosity
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
    • H01M8/04223—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids during start-up or shut-down; Depolarisation or activation, e.g. purging; Means for short-circuiting defective fuel cells
    • H01M8/04231—Purging of the reactants
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
    • H01M8/04291—Arrangements for managing water in solid electrolyte fuel cell systems
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/50—Fuel cells

Definitions

  • the invention relates to a fuel cell stack.
  • fuel cell stacks employ a so-called circulation type fuel-gas passage structure for distributing fuel gas within the fuel cell stack.
  • the circulation type fuel-gas passage structure is used to discharge nitrogen gas, which accumulates within a fuel-gas passage portion and interferes with the supply of fuel gas, to the outside of the fuel cell stack.
  • the nitrogen gas enters the fuel-gas passage portion from an oxidizing-gas passage portion via the electrolyte.
  • a non-circulation type fuel-gas passage structure for fuel cell stacks has been proposed which is used with a nitrogen gas storage provided outside of the fuel cell stack and connected to the fuel cell stack via a valve, which is described in Japanese Patent Application Publication No. JP 2005-243476 A .
  • fuel gas is supplied to the fuel cell stack while repeatedly switching the state of the valve between the open state and the closed state (non-continuous operation type fuel cell system). That is, when fuel gas is supplied to the fuel cell stack, the valve is closed, whereby the pressure in the fuel cell stack r increases.
  • Another fuel cell has been disclosed by Figure 6 of US20040048128 .
  • the invention has as its object to provide a technology that enables continuous operation of a fuel-cell stack having a non-circulation type fuel gas passage structure.
  • a first aspect of the invention relates to a fuel cell according to claim 1, having: an electrolyte; an anode provided on one side of the electrolyte and having a fuel-gas consuming face at which fuel gas is consumed; a cathode provided on the other side of the electrolyte and having an oxidizing-gas consuming face at which oxidizing gas is consumed; a first separator provided adjacent to the hydrogen-gas consuming face; a second separator provided adjacent to the oxidizing-gas consuming face; and a hydrogen-gas passage portion forming a passage through which fuel gas is supplied to predetermined regions of the fuel-gas consuming face of the anode.
  • the fuel cell has an anode dead-end structure in which almost the entire amount of the supplied fuel gas is consumed at the fuel-gas consuming face of the anode.
  • the hydrogen-gas passage portion includes a fuel gas supply plate functioning as a reverse-flow suppressing portion and having a plurality of through holes via which hydrogen gas is supplied at a flow rate equal to or higher than the flow rate predetermined based on the nitrogen diffusion rate, the reverse-flow suppressing portion being located between the first separator and the anode.
  • a first passage portion is located between a first side of the reverse-flow suppressing portion and the first separator and a second passage portion is provided at the other, second, side of the reverse-flow suppressing portion.
  • the first passage portion and the second passage portion each have a porous portion permeable to hydrogen gas, and a pressure loss per unit length of the porous portion of the second passage portion is smaller than a pressure loss per unit length of the porous portion of the first passage portion.
  • fuel gas i.e. hydrogen gas
  • This structure also promotes dispersion of nitrogen gas in the second passage portion and thus inhibits nitrogen gas from entering the first passage portion from the second passage portion.
  • fuel-gas consuming face represents a face of the anode at which a layer that consumes fuel gas is exposed to the fuel-gas passage portion
  • oxidizing-gas consuming face represents a face of the cathode at which a layer that consumes oxidizing gas is exposed to an oxidizing-gas passage portion.
  • consumption is intended to have a broad meaning including both consumptions for reactions and cross-leaks.
  • the sentence “the fuel gas has an operation mode” means that the described operation mode is not always necessary in effect and there may be various other modes including the one that is periodically used to discharge fuel gas from the fuel cell for maintenance.
  • predetermined regions include, for example, regions to which fuel gas is supplied from corresponding orifices.
  • the above-described fuel cell may be such that the first passage portion is a passage portion through which fuel gas is distributed toward the predetermined regions of the fuel-gas consuming face of the anode; the second passage portion is a passage portion through which the distributed gases are supplied to the predetermined regions of the fuel-gas consuming face of the anode, respectively; and the reverse-flow suppressing portion is a portion that suppresses a reverse flow from the second passage portion to the first passage portion.
  • first passage portion corresponds to, for example, the hydrogen-side porous passage portion 14h in the example embodiment
  • second passage portion corresponds to, for example, the hydrogen-side electrode layer 22 in the example embodiment
  • reverse-flow suppressing portion corresponds to, for example, the fuel gas supply plate 21n in the example embodiment.
  • the above-described fuel cell may be such that the reverse-flow suppressing portion supplies fuel gas at a flow rate equal to or higher than a flow rate that is predetermined based on a diffusion rate of nitrogen in a given operation state of the fuel cell. According to this structure, the flow of nitrogen gas dispersing from the second passage portion to the first passage portion can be suppressed more properly.
  • the above-described fuel cell may be such that the second passage portion has a plurality of holes communicating with at least one of the through holes of the reverse-flow suppressing portion. According to this structure, exhaust water membranes are divided by the supplied fuel gas, whereby flooding of exhaust water can be effectively suppressed.
  • the above-described fuel cell may be such that the water repellency of the second passage portion increases toward the electrolyte in a direction in which components of the fuel cell are stacked, such that the hydrophilicity of the second passage portion increases toward the side away from the electrolyte in a direction in which components of the fuel cell are stacked, or such that the second passage portion is formed of a porous material, the density of which increases toward the side away from the electrolyte in a direction in which components of the fuel cell are stacked.
  • These structures may be employed in various combinations.
  • the drainability of exhaust water improves and flooding of exhaust water can be effectively suppressed at the fuel-gas side electrode.
  • the above-described fuel cell may be such that: the oxidizing gas contains air; the anode is provided on an outer face of the electrolyte on one side thereof and has a gas diffusibility; the cathode is provided on an outer face of the electrolyte on the other side thereof and has a gas diffusibility; a conductive sheet portion is provided adjacent to an outer face of the anode, which has a gas impermeability, a sheet-like shape, and a plurality of through holes that spread two-dimensionally along a horizontal plane of the conductive sheet portion; a conductive porous portion is provided adjacent to an outer face of the conductive sheet portion and forming a fuel-gas supply passage through which fuel gas is dispersedly distributed in directions along the horizontal plane of the conductive sheet portion; and a separator is provided adjacent to an outer face of the conductive porous portion.
  • the conductive sheet portion inhibits the leak gas, which leaks from the cathode side to the anode side, from entering the conductive porous portion, and therefore fuel gas can be dispersedly supplied to the anode. As a result, the power generation efficiency of the entire fuel cell improves.
  • the above-described fuel cell may be such that the first passage portion is partitioned off from the fuel-gas consuming face of the anode.
  • partitioned is intended to have a broad meaning, referring to the states where two or more regions or portions are partitioned off from each other such that contacts or fluid movements between the regions or portions are inhibited as well as the states where the regions or portions are completely partitioned off from each other.
  • the above-described fuel cell may be such that the fuel-gas passage portion has a pressure-loss portion that produces a pressure loss that is predetermined based on the supply amount of the fuel gas.
  • the above-described fuel cell may be a solid polymer fuel cell.
  • the above-described fuel cell may be such that the aperture ratio of the fuel-gas supply plate is approximately 1 % or lower.
  • aperture ratio is the value obtained by dividing the total area of the at least one opening by the area of the entire fuel-gas supply plate.
  • the fuel cell of the invention may incorporate the structures shown in FIG. 50 and FIG. 51 .
  • the structure shown in FIG. 50 includes a first passage and a second passage.
  • the first passage is located upstream of the second passage.
  • the first passage and the second passage communicate with each other via a high-resistance communication passage portion 2100X having a flow resistance higher than the first passage or the second passage.
  • fuel gas is distributed from the outside of the generation region (the outside of the fuel cell) via fuel gas distribution passages (manifolds).
  • fuel gas is distributed from the first passage to the second passage mainly via the high-resistance communication passage portion 2100x (e.g., only via the high-resistance communication passage portion 2100X).
  • the first and second passages may be formed by porous materials as in the example described below.
  • they may be formed by using sealers S1, S2 ( FIG. 50 ) or using a honeycomb-shaped member H2 ( FIG. 51 ).
  • the high-resistance communication passage portion 2100X may be a plate member having inlet openings 2110x (through holes) that are formed so as to spread along the horizontal plane of said plate member.
  • the high-resistance communication passage portion 2100X has at least one of the following roles.
  • the first role is to limit the supply of fuel gas to the region of the second passage that is adjacent the fuel gas distribution passage.
  • the second role is to reduce the unevenness in the gas pressure acting in the direction perpendicular to the planar direction of the second passage extending along the anode reaction portion.
  • the third role is to change the direction of fuel gas flowing in the first passage from the planar direction of the first passage to a direction crossing or perpendicular to the planar direction of the first passage.
  • the invention can be applied in various forms including fuel cells, fuel-cell stack manufacturing methods, fuel-cell systems, fuel-cell-equipped vehicles, membrane-electrode assemblies, and so on.
  • FIG. 1 is a view schematically showing the configuration of a fuel cell vehicle 1000 according to an example embodiment of the invention.
  • the fuel cell vehicle 1000 has a power supply system 200, a load section 300, and a controller 250.
  • the power supply system 200 supplies electric power for propelling the fuel cell vehicle 1000.
  • the load section 300 converts the supplied electric power into drive force for propelling the fuel cell vehicle 1000.
  • the controller 250 controls the power supply system 200 and the load section 300.
  • the power supply system 200 has a fuel cell system 210n, a secondary battery 226 (also called “capacitor”), and a DC-DC converter 264.
  • the load section 300 has a drive circuit 360, a motor 310, a gear mechanism 320, and wheels 340.
  • the fuel cell system 210n is required to be small and light-weight and have a large capacity.
  • the controller 250 is electrically connected to the fuel cell system 210n, the DC-DC converter 264, and the drive circuit 360, and executes various control procedures including those for controlling these circuits. These control procedures are provided as computer programs stored in a memory incorporated in the controller 250 (not shown in the drawings) and executed by the controller 250.
  • the memory in the controller 250 may be selected from among various data storages including ROMs and hard drives.
  • FIG. 2 is a block diagram showing the configuration of a fuel cell system 210 according to a comparative example.
  • the fuel cell system 210 has a fuel cell stack 100, an air supply system 230 for supplying air to the fuel cell stack 100 as oxidizing gas, a hydrogen-gas circulation system 220 for circulating hydrogen gas through the fuel cell stack 100 as fuel gas, and a hydrogen gas supply system 240 for supplying hydrogen gas to the hydrogen-gas circulation system 220.
  • the controller 250 controls the air supply system 230, the hydrogen-gas supply system 240, and the hydrogen-gas circulation system 220.
  • the fuel cell stack 100 is a solid polymer electrolyte fuel cell stack constituted of a plurality of fuel cells stacked on top of each other, which will be described later.
  • An air passage 235 and a fuel-gas passage 225 are formed through the fuel cells.
  • the air supply system 230 delivers humidified air into the air passage 235.
  • the air supply system 230 has a blower 231 for taking in air from the outside, a humidifier 239 for humidifying the air taken in via the blower 231, a humidified-air supply pipe 234 for supplying the humidified air to the air passage 235, and a discharge pipe 236 for discharging air from the air passage 235.
  • the hydrogen gas supply system 240 has a hydrogen tank 242 for storing hydrogen gas and a hydrogen valve 241 for controlling the supply of hydrogen gas to the hydrogen-gas circulation system 220.
  • the hydrogen-gas circulation system 220 has a circulation pump 228 for circulating hydrogen gas in the hydrogen-gas circulation system 220, a hydrogen-gas supply pipe 224 via which the hydrogen gas discharged from the circulation pump 228 is supplied to the fuel-gas passage 225, a gas-discharge pipe 226 via which water-containing hydrogen gas is supplied from the fuel-gas passage 225 to a gas-liquid separator 229, the gas-liquid separator 229 that separates the water-containing hydrogen gas into water and hydrogen gas and then supplies the obtained hydrogen gas to the circulation pump 228, and an water-discharge valve 229V.
  • the purpose of circulating hydrogen gas through the gas-discharge pipe 226, the gas-liquid separator 229, and the circulation pump 228 in this related-art fuel cell system is to prevent that the nitrogen gas entering the fuel-gas passage 225 from the air passage 235 through an electrolyte layer, which will be described later, accumulates in the fuel-gas passage 225, because it may make the fuel cell stack 100 incapable of generating electric power.
  • FIG. 3 shows graphs G1, G2 each indicating the state of the fuel cell system 210 when the circulation through the fuel-gas passage 225 is stopped. More specifically, the graph G1 represents the relation between the time elapsed from when the discharge of fuel gas is stopped and the cell voltage, and the graph G2 represents the relation between the time elapsed from when the discharge of fuel gas is stopped and the hydrogen partial pressure (i.e., the hydrogen partial pressure in the fuel-gas passage 225).
  • the cell voltage gradually decreases with time.
  • This decrease in the cell voltage results from a decrease in the hydrogen partial pressure such as shown in the graph G2.
  • Such a decrease in the hydrogen partial pressure is caused by an increase in the partial pressure of the nitrogen gas entering the hydrogen-gas supply passage 225 from the air passage 235 as mentioned earlier.
  • Japanese Patent Application Publication No. 2005-243476 JP-A-2005-243476 proposes to supply hydrogen gas to a fuel cell stack while increasing the total pressure of hydrogen gas so that the hydrogen partial pressure is maintained at a sufficient level against an increase in the nitrogen partial pressure.
  • the allowable total pressure of hydrogen gas is limited, the hydrogen gas needs to be discharged periodically.
  • FIG. 4 is a block diagram showing the configuration of the fuel cell system 210n of the example embodiment of the invention.
  • the fuel cell system 210n has a gas-discharge pipe 227 and a gas-discharge valve 230V for maintenance use in place of the gas discharge pipe 226, the gas-liquid separator 229, and the circulation pump 228 together constituting the hydrogen-gas circulation passage described above.
  • the fuel cell system 210 has a fuel cell stack 100n in place of the fuel cell stack 100.
  • the fuel cell stack 100n has been newly designed to enable stable fuel cell operation even after the discharging of fuel gas is stopped.
  • FIG. 5 schematically shows the structure of the fuel cell stack 100 of the comparative example.
  • the fuel cell stack of the comparative example and the fuel cell stack of the following example embodiment of the invention are both a solid polymer fuel cell stack.
  • the fuel cell stack 100 of the comparative example is constituted of membrane-electrode assemblies 20, hydrogen-side porous passage portions 14h, and air-side porous passage portions 14a, and separators 40, which are alternately stacked on top of each other and sandwiched by terminals, insulators, and end plates, not shown in the drawings, from both sides.
  • the membrane-electrode assemblies 20 are a component at which electrochemical reactions occur, and each membrane-electrode assembly 20 is constituted of a hydrogen-side electrode layer 22, an electrolyte membrane 23, and an air-side electrode layer 24.
  • the electrolyte membrane 23 is an ion-exchange membrane made of a solid polymer material and having a proton conductivity.
  • the hydrogen-side electrode layer 22 and the air-side electrode layer 24 are each formed of conductive carriers and catalysts supported thereon.
  • the hydrogen-side porous passage portion 14h and the air-side porous passage portion 14a serve as the passages for the reaction gases used for electrochemical reactions at the membrane-electrode assembly 20 (i.e., hydrogen-containing gas and oxygen-containing gas) and also serve as power collectors.
  • the hydrogen-side porous passage portion 14h and the air-side porous passage portion 14a are formed of a conductive material having a gas permeability, such as carbon papers, carbon cloths, carbon nanotubes, etc.
  • a seal portion 50 is provided so as to surround each membrane-electrode assembly 20 and the porous passage portions 14h, 14a adjacent said membrane-electrode assembly 20.
  • the seal portion 50 serves to seal the reaction gas passages formed by the porous passage portions 14h, 14a and includes a gasket 52 and a seal frame 54.
  • the separators 40 serves as walls of the porous passage portions 14h, 14a forming the reaction gas passages.
  • the separators 40 are formed of a material that is conductive but not permeable to the reaction gases, such as gas-impermeable dense carbon obtained by compressing carbon, calcined carbon, stainless steel, and so on.
  • each separator 40 has a three-layer structure incorporating, as its integrated portions, a cathode-side separator 41 abutting on the air-side porous passage portion 14a, an anode-side separator 43 abutting on the hydrogen-side porous passage portion 14h, and an intermediate separator 42 interposed between the cathode-side separator 41 and the anode-side separator 43.
  • FIG. 6 is a view illustrating the gas passages in the fuel cell stack 100 of the comparative example together with FIG. 5 .
  • the gas passages in the fuel cell stack 100 include the fuel-gas passage 225 ( FIG. 2 ), the air passage 235 ( FIG. 2 ), a coolant passage.
  • the coolant passage is defined by a coolant supply manifold 11wm, a coolant supply passage 12w, and a coolant discharge manifold 13wm, and the coolant flows through these portions in this order.
  • the fuel-gas passage 225 ( FIG. 2 ) is defined by two fuel-gas supply manifolds 11hmL, 11hmR, a fuel-gas supply passage 12h, a fuel-gas supply hole 13h, the hydrogen-side porous passage portion 14h, a fuel-gas discharge hole 15h, a fuel-gas discharge passage 16h ( FIG. 5 ), and two fuel-gas discharge manifolds 17hmL, 17hmR ( FIG. 5 ), and the fuel gas flows through these portions in this order.
  • the air passage 235 ( FIG. 2 ) is defined by an air supply manifold 11am, an air supply passage 12a, an air supply hole 13a, the air-side porous passage portion 14a, an air discharge hole 15a, an air discharge passage 16a ( FIG. 5 ), an air-discharge manifold 17am ( FIG. 5 ), and the air flows through these portions in this order.
  • FIG. 7 is a view illustrating a state where nitrogen stagnation Cn is occurring in the fuel cell stack 100 of the comparative example due to the stoppage of the fuel gas discharge. As is evident from FIG. 7 , the nitrogen stagnation Cn occurs in the downstream region of the hydrogen-side porous passage portion 14h.
  • FIG. 8 is a flowchart illustrating the mechanism of occurrence of nitrogen stagnation in the fuel-gas passage, which has been presumed by the inventors.
  • FIG. 9 is a view illustrating how a nitrogen stagnation occurs in the fuel-gas passage.
  • fuel gas is supplied along the reaction face of the membrane-electrode assembly 20 that consumes fuel gas (fuel-gas consumption face)
  • the partial pressure of hydrogen gas in the fuel gas decreases as the fuel gas flows from upstream to downstream. This presumption has been made in the course of making the invention, and therefore the invention is not based on the assumption that the presumed mechanism actually exists.
  • step S1100 when fuel gas is being supplied, as the fuel gas moves from the region A to the region B of the membrane-electrode assembly 20, a certain amount of hydrogen gas in the fuel gas is consumed at the region A (step S1100), and therefore the hydrogen partial pressure in the fuel gas supplied to the region B decreases accordingly (step S1200).
  • the hydrogen partial pressure decreases in the same way when the fuel gas moves from the region B to the region C and from the region C to the region D.
  • the hydrogen partial pressure is significantly lower at the region D in the downstream side of the membrane-electrode assembly 20 than at the region A (step S1300).
  • a significant decrease in the hydrogen partial pressure suppresses the consumption of hydrogen at the region D (step S1400) and thus suppresses the supply of fuel gas (the flow rate of fuel gas) (step S1500).
  • Such suppression of fuel-gas supply continues synergistically, and cyclically, until the end of the fuel gas supply to the region D (step S1600).
  • step S1700 nitrogen gas stagnates in the region D, and the fuel gas supply to the region D stops (step S1700). Further, in such a synergistic vicious cycle of fuel-gas supply, the nitrogen gas stagnation area extends from the region D to the region C and then to the region B on the upstream side.
  • FIG. 10 is a view schematically showing the structure of the fuel cell stack 100n of the example embodiment.
  • the fuel cell stack 100n is different from the fuel cell stack 100 of the comparative example in that the fuel-gas passage 225 ( FIG. 2 ) is replaced with a newly deigned fuel-gas passage 225n ( FIG. 3 ).
  • the air passage 235 and the coolant passage in the fuel cell stack 100n of the example embodiment are the same as those in the fuel cell stack 100 of the comparative example.
  • FIG. 11 is a view showing the gas passages in the fuel cell stack 100n together with FIG. 10 .
  • the fuel-gas passage 225n is different from the fuel-gas passage 225 of the comparative example in that the fuel-gas passage 225n has a fuel-gas supply plate 21n that suppresses stagnation of the nitrogen gas that emerges in the fuel-gas passage 225 during the stoppage of fuel gas discharge and gaskets 14hg and 52n that surround the hydrogen-side electrode layer 22.
  • a number of orifices 211n each measuring about 1 mm in diameter are formed at intervals of 2 cm, and three air holes 212n leading to the air supply manifold 11am are formed.
  • the gaskets 14hg and 52n are preferably made of a material more rigid than the material of the hydrogen-side electrode layer 22 and having a particularly high rigidity against a compressive force acting across their thickness.
  • the gasket 14hg surrounding the hydrogen-side electrode layer 22 may be formed by impregnating a gasket around the hydrogen-side electrode layer 22.
  • FIG. 12 is a view illustrating how the fuel-gas supply plate 21n is arranged in each cell of the fuel cell stack 100n of the example embodiment.
  • the fuel-gas supply plate 21n is sandwiched between the hydrogen-side porous passage portion 14h and the hydrogen-side electrode layer 22 of the membrane-electrode assembly 20.
  • the fuel-gas supply plate 21n is a metal plate inhibiting the fuel gas and the oxidizing gas from leaking to the opposite sides, and the use of such a metal plate provides the advantages of increased rigidity of the membrane-electrode assembly 20n, which suppresses its thermal contraction, and increased resistance against the differential pressure between the fuel gas and the oxidizing gas.
  • the fuel-gas supply plate 21n is formed as a portion of the membrane-electrode assembly 20n by being attached thereto.
  • the fuel-gas supply plate 21n may be formed as a portion of the hydrogen-side porous passage portion 14h by being attached thereto, or the fuel-gas supply plate 21n may be provided as an independent component.
  • the fuel-gas passage portion is not necessarily a porous passage portion.
  • the fuel-gas passage portion may be a spacer (not shown in the drawings) disposed on at least one side of the fuel-gas supply plate 21n and forming at least one of a gas passage upstream and downstream of the fuel-gas supply plate 21n.
  • FIG. 13 is a view illustrating how fuel gas is distributed via the fuel-gas supply plate 21n in the fuel cell stack 100n.
  • fuel gas enters the hydrogen-side porous passage portion 14h from the fuel-gas supply hole 13h ( FIG. 11 ) and then reaches the orifices 211n of the fuel-gas supply plate 21n, and then the fuel gas enters the hydrogen-side electrode layer 22 via the orifices 211n.
  • the hydrogen-side porous passage portion 14h forming the passage for distributing fuel gas to the orifices 211n is partitioned off from the hydrogen-side electrode layer 22 by the fuel-gas supply plate 21n, the aforementioned decrease in the hydrogen partial pressure ( FIG. 8 and FIG. 9 ) is suppressed.
  • partition is intended to have a broad meaning, referring to the states where two or more regions or portions are partitioned off from each other such that contacts or fluid movements between the regions or portions are inhibited as well as the states where the regions or portions are completely partitioned off from each other.
  • the inventors have empirically discovered that if nitrogen gas can be stabilized in a dispersed state in the vicinity of the membrane-electrode assembly 20 while supplying fuel gas to the hydrogen-side electrode layer 22 side continuously, electric power can be generated stably, and continuously, even if the fuel gas is not circulated.
  • FIG. 14 is a flowchart illustrating a presumed mechanism of hydrogen gas supply stabilization.
  • FIG. 15 is a view illustrating how stagnant nitrogen gas spreads in the fuel-gas passage portion. According to the presumed mechanism, even if the nitrogen partial pressure increases at some part of the fuel-gas passage portion due to some external disturbances or interferences, the increase in the nitrogen partial pressure is cancelled. That is, even if the nitrogen partial pressure increases in a certain region or regions, the increase in the nitrogen partial pressure is cancelled in the mechanism described below.
  • the diameter of each orifice 211n of the fuel-gas supply plate 21 n and the interval between the orifices 211n are preferably set such that the fuel gas flow rate or the pressure loss at each orifice 211n is large enough to suppress a reverse flow of fuel gas due to the dispersion of nitrogen gas under a given fuel cell operation state (e.g., rated output operation state).
  • a given fuel cell operation state e.g., rated output operation state
  • the aperture ratio of the fuel-gas supply plate 21n is calculated by dividing the sum of the areas of the orifices 211n by the entire area of the fuel-gas supply plate 21n.
  • the inventors have confirmed, through calculations, that setting the aperture ratio of the fuel-gas supply plate 21 n to an order of one-hundredth of the area of a circulation type fuel-gas passage does not lead to an excessive increase in the power loss at the circulation pump (compressor) 228 for circulating fuel gas ( FIG. 2 ).
  • FIG. 16 is a view illustrating the first modification example of the fuel-gas passage portion.
  • the fuel-gas supply plate 21n is replaced with a dense porous member 21v1 having a higher density or a larger pressure loss than the hydrogen-side porous passage portion 14h. That is, the hydrogen-side porous passage portion 14h serving as a fuel-gas distribution passage is partitioned off from the hydrogen-side electrode layer 22 by the dense porous member 21v1 that is formed, preferably, so as to provide a predetermined pressure loss or a predetermined fuel gas flow rate.
  • FIG. 17 and FIG. 18 are views illustrating the second modification example of the fuel-gas passage portion.
  • the fuel-gas supply plate 21n is replaced with a fuel-gas supply plate 21v2 that is a pressed metal plate.
  • the fuel-gas supply plate 21v2 has convex portions 21v2t each forming a fuel-gas passage on the upstream side of the fuel-gas supply plate 21v2 and having an orifice 211v2. According to this structure, because the fuel-gas supply plate 21v2 also forms the gas passages on the upstream side thereof, and it eliminates the need of providing the hydrogen-side porous passage portion 14h of the foregoing example embodiment, which is desirable.
  • FIG. 19 is a view showing other example structure of the second modification example.
  • stoppers 21v2c which are conductive, are provided to form fuel-gas passages on the upstream side of a fuel-gas supply plate 21v2a.
  • the convex portions 21v2a of the fuel-gas supply plate 21v2a need not receive the stacking load of the fuel cell stack 100n, the freedom in designing the shape of each convex portion 21v2a increases, which is desirable.
  • the convex portions 21 v2a may be formed in a diamond shape when viewed from above.
  • FIG. 20 is a view illustrating the third modification example of the fuel-gas passage portion.
  • a fuel-gas passage portion 14hv3 which is a porous member, has communication holes 210v3 formed within the fuel-gas passage portion 14hv3 and orifices 211 v3 extending from the respective communication holes 210v3 to the outside, and fuel gas is distributed to respective regions through the communication holes 210v3 and the orifices 211v3.
  • a porous member may be adapted to have the function of distributing fuel gas.
  • FIG. 21 is a view illustrating the fourth modification example of the fuel-gas passage portion.
  • a fuel passage portion 14v4 is formed of pipes 210v4 each having orifices 211v4, not a porous member nor a pressed metal plate, and fuel gas is distributed to respective regions via the orifices 211v4.
  • the fuel-gas passage portion may have various structures as well as those using a porous member and a pressed metal plate.
  • fuel gas directly flows to the respective regions of the hydrogen-side electrode layer 22, where fuel gas is consumed, without going through other regions, or fuel gas flows to the hydrogen-side electrode layer 22 from the area distant from the hydrogen-side electrode layer 22 (preferably, a passage partitioned off from the hydrogen-side electrode 22) in the direction crossing the reaction face of the electrolyte membrane 23 (a catalyst face not shown in the drawings).
  • the above “consumed” is intended to have a broad meaning including both consumptions for reactions and cross-leaks.
  • the hydrogen-side electrode layer 22 has a flat surface because nitrogen stagnations tend to occur at indentations and concaves.
  • the above-described structures eliminating the need for fuel-gas circulation also provide a significant advantage that the fuel cell system can be efficiently operated at a high pressure, which could not be expected by those skilled in the art at the time of filing this application.
  • the electromotive force of a fuel cell system can be increased by increasing the pressure in fuel-gas passages of the fuel cell system.
  • increasing the pressure in the fuel-gas passages leads to an increase in the load on the circulation pump and thus to a decrease in the operation efficiency of the fuel cell system.
  • the formula F1 indicates that the electromotive force E (EMF) is correlative to the activation of hydrogen gas (hydrogen partial pressure / standard pressure) and to the activation of oxygen gas (oxygen partial pressure / standard pressure).
  • the formula G2 corresponds to the hydrogen gas term indicating an increase in the electromotive force resulting from an increase in the hydrogen partial pressure (P 1 ⁇ P 2 ).
  • the fuel cell system can be made small and light-weight, which is especially important for use in vehicles.
  • increasing the reaction gas pressure in a small fuel cell system inevitably results in a decrease in its operation efficiency, the above-described effect of the example embodiment could not be expected by those skilled in the at the time of filing this application.
  • the dispersing flow of nitrogen gas from the hydrogen-side electrode layer 22 to the hydrogen-side porous passage portion 14h is suppressed and the hydrogen-side porous passage portion 14h is partitioned from the hydrogen-side electrode layer 22.
  • the higher the dispersion rate of nitrogen gas the more difficult it is to partition the hydrogen-side porous passage portion 14h from the hydrogen-side electrode layer 22 properly.
  • the partition can be accomplished relatively easily. This is because the dispersion rate of nitrogen gas significantly increases as the operation temperature increases. Meanwhile, increasing the fuel gas pressure in the fuel cell system causes a decrease in the dispersion rate of nitrogen gas, and therefore it is desirable to operate solid polymer fuel cells at a high pressure.
  • the formula F3 in FIG. 24 represents the Fick's 1st law regarding steady flows.
  • the dispersion rate of nitrogen gas is proportional to the gradient of nitrogen gas concentration and the dispersion factor of nitrogen gas.
  • the dispersion factor has a positive correlation with the temperature and a negative correlation with the pressure. As such, the above-described effects can be obtained.
  • FIG. 25 is a view illustrating the difference in density between the hydrogen-side porous passage portion 14h, which is present on the upstream side of the fuel-gas supply plate 21n, and the gas diffusion layer of the hydrogen-side electrode layer 22, which is present on the downstream side of the fuel-gas supply plate 21n.
  • the density of the material of the hydrogen-side porous passage portion 14h on the upstream side is lower than the density of the gas diffusion layer of the hydrogen-side electrode layer 22 on the downstream side, which suppresses the decrease in the pressure of fuel gas when the fuel gas flows through the inside of the hydrogen-side porous passage portion 14h.
  • the pressures applied from the fuel gas to the respective orifices 211n can be easily equalized, which is desirable.
  • the density of the material of the gas diffusion layer of the hydrogen-side electrode layer 22 on the downstream side is lower than the density of the material of the hydrogen-side porous passage portion 14h on the upstream side.
  • This structure inhibits the nitrogen gas from entering the hydrogen side porous passage portion 14hv1 on the upstream side from the gas diffusion layer of the hydrogen-side electrode layer 22v1 on the downstream side, which is desirable.
  • the equalization of the fuel gas pressures applied to the respective orifices 211n can be accomplished also by setting the diameter of each orifice 21n and each interval between the orifices 21n variably as needed, for example.
  • FIG. 26 is a view showing the gas diffusion layer of a hydrogen-side electrode 22v2 according to the second modification example.
  • the gas diffusion layer of the hydrogen-side electrode 22v2 has a two-layer structure.
  • the density of the material of the gas diffusion layer adjacent the electrolyte membrane 23 is lower than the density of the material of the other gas diffusion layer, or the pressure loss at the gas diffusion layer adjacent the electrolyte membrane 23 is smaller than the pressure loss at the other gas diffusion layer.
  • This structure causes the exhaust water discharged from the electrolyte membrane 23 to disperse toward the hydrogen-side porous passage portion 14h and thus prevents the exhaust water from flooding, which may otherwise interfere with the supply of fuel gas.
  • the gas diffusion layer of the hydrogen-side electrode 22v may employ any structure. That is, while the gas diffusion layer of the hydrogen-side electrode 22v is a two-layer porous portion in the example described above, it may alternatively be a porous portion having a single layer or three or more layers in which the porous material density varies as described above.
  • FIG. 27 is a view showing the gas diffusion layer of a hydrogen-side electrode 22v3 according to the third modification example.
  • the gas diffusion layer of the hydrogen-side electrode 22v3 has a three-layer structure.
  • the water repellencies of the materials of the three gas diffusion layers increase in steps toward the electrolyte membrane 23 or the hydrophilicities of the materials of the three gas diffusion layers decrease in steps toward the electrolyte membrane 23.
  • This structure also causes dispersion of the exhaust water discharged from the electrolyte membrane 23 and thus prevents the flooding of exhaust water.
  • Such dispersing discharge of exhaust water is accomplished by replacing the densities of the materials of the respective gas diffusion layers, or the like, of the second modification example with the water repellencies or the hydrophilicities of the materials of the respective gas diffusion layers. Therefore, as long as the hydrophilicity of the gas diffusion layer of the hydrogen-side electrode 22v3 increases toward the side away from the electrolyte membrane 23 or as long as the water repellency of the gas diffusion layer decreases toward the side away from the hydrogen-side electrode 22v3, the gas diffusion layer of the hydrogen-side electrode 22v3 may employ any structure.
  • the gas diffusion layer of the hydrogen-side electrode 22v3 may be a porous portion having a single layer or three or more layers in which the hydrophilicity or the water repellency varies as described above.
  • the water repellency, the hydrophilicity, and the density of the gas diffusion layer may be set in various combinations as needed to achieve a desired effect.
  • FIG. 28 is a view showing the gas diffusion layer of a hydrogen-side electrode 22v4 according to the fourth modification example.
  • the gas diffusion layer of the hydrogen-side electrode 22v4 differs from the foregoing gas diffusion layers in that, communication holes 212v4 are formed at the positions corresponding to the orifices 211n of the fuel-gas supply plate 21n.
  • the communication holes 212v4 serve to divide and disperse the exhaust water stagnating on the surface of the catalyst layer of the hydrogen-side electrode 22v4 (not shown in the drawings).
  • the communication holes 212v4 are smaller in diameter than the orifices 211n so that exhaust water Wd discharged via the communication holes 212v4 is absorbed into the hydrogen-side electrode 22v4, whereby the orifices 211n are prevented from being clogged up with the exhaust water, which is desirable.
  • FIG. 29 is a view showing the gas diffusion layer of a hydrogen-side electrode 22v5 according to the fifth modification example.
  • communication holes 212v5 are formed at the positions corresponding to the orifices 211n of the fuel-gas supply plate 21n.
  • the communication holes 212v5 serve to divide and disperse the exhaust water stagnating on the surface of the hydrogen-side electrode 22v5, as in the fourth modification example.
  • the fifth modification example differs from the fourth modification example in that the communication holes 212v5 are larger in diameter than the orifices 211n.
  • the exhaust water wd discharged from the communication holes 212v5 is blocked by the fuel-gas supply plate 21n and then absorbed into the hydrogen-side electrode 22v5, whereby the orifices 211n are prevented from being clogged up with the exhaust water as in the forth modification example.
  • the exhaust water can be divided if the communication holes 212v4, 212v5 communicate with the respective orifices 211n, it is not essential that the diameters of the communication holes 212v4, 212v5 be different from those of the orifices 211n.
  • FIG. 30 is a view showing the gas diffusion layer of a hydrogen-side electrode 22v6 according to the sixth modification example.
  • the communication holes 212v5 are formed at the positions corresponding to the orifices 211n of the fuel-gas supply plate 21n and the communication holes 212v5 are larger in diameter than the orifices 211n, as in the fifth modification example described above.
  • a difference of the sixth modification example from the fifth modification example lies in that a fuel-gas supply plate 21v6 is provided with a positioning member Cg defining the positional relation between the orifices 211n and the hydrogen-side electrode 22v6.
  • the use of the positioning member Cg increases the reliability in obtaining the above-described effects.
  • the above-described structures of the example embodiment each enable the fuel cell system, which does not circulate fuel gas, to operate in its normal operation mode while dispersing exhaust water without discharging water vapor together with exhaust fuel gas, thus smoothening the use cycle of water to humidify fuel gas in the fuel cell stack 100.
  • FIG. 31 to FIG. 35 are views illustrating modification examples of the air-side porous passage portion 14a.
  • the structures employed in these examples are adapted to solve a problem that may occur on the air passage side in non-circulation type fuel-gas supply systems. This problem is a new problem that has been recognized by the inventors.
  • the comparative example illustrated in FIG. 5 employs a structure in which the reaction gases to be supplied to the respective electrodes (i.e., fuel gas and oxidizing gas) flow in the opposite directions, that is, in which the inlet of the reaction passage on one side of the membrane-electrode assembly 20 is present near the outlet of the reaction passage on the other side of the membrane-electrode assembly 20.
  • the reaction gases to be supplied to the respective electrodes i.e., fuel gas and oxidizing gas
  • FIG. 31 is a view showing an air-side electrode porous passage portion 14av1 of the first modification example.
  • FIG. 32 is a view showing an air-side electrode porous passage portion 14av2 of the second modification example.
  • FIG. 33 is a view showing the gas passages within a fuel cell stack incorporating the air-side electrode porous passage portion 14av1 of the first modification example.
  • the air-side electrode porous passage portion 14av2 of the second modification example has the same structure as the air-side porous passage portion 14a except that the air-side electrode porous passage portion 14av2 has a grooved passage portion 14c (e.g., a perforated metal).
  • the air-side electrode porous passage portion 14av2 provides the same effects as those obtained with the air-side electrode porous passage portion 14av1.
  • the grooved passage portion 14c may be used in combination with the air-side electrode porous passage portion 14av1 that has grooves as described below, and a hydrophilization treatment may be applied to the grooves of the air-side electrode porous passage portion 14av1.
  • the air-side electrode porous passage portion 14as1 of the first modification example differs from the air-side porous passage portion 14a of the example embodiment in that grooves 14ag1 are formed in the surface of the air-side electrode porous passage portion 14av1 on the side opposite the surface abutting on the air-side electrode layer 24. According to this structure, air is supplied to the air-side electrode porous passage portion 14as1 via the grooves 14ag1, and this suppresses the difference between the humidity on the upstream side and the humidity on the downstream side.
  • the portions near the air supply hole 13a are hydrophilized, and the air passages are formed such that air flows from the lower side to the upper side.
  • the hydrophilization helps retain water and thus prevent dryout, and the airflow from the lower side to the upper side helps retain water in the lower side under the gravity.
  • FIG. 34 is a view showing an air-side electrode porous passage portion 14av3 of the third modification example.
  • the air-side electrode porous passage portion 14av3 of the third modification example differs from the air-side electrode porous passage portion 14av1 of the first modification example in that water retention grooves 14agv1 are formed in the portion of the air-side electrode porous passage portion 14av3 in the vicinity of the air discharge passage 16a (the air outlet side).
  • a research by the inventors has proved that it is preferable that the water retention grooves 14agv1 be approximately 1 mm or larger in width.
  • each water retention groove 14agv1 may be continuously formed from one end to the other end of the air-side electrode porous passage portion 14av3, or may be divided into two or more separate portions, as in the case of an air-side electrode porous passage portion 14av4 shown in FIG. 35 , and each portion may have different length and width from others. Further, each water retention groove 14agv1 may be hydrophilized.
  • the reaction distribution becomes uniform as well as the humidification state. That is, the upstream region of the fuel-gas passage where the hydrogen partial pressure is high ( FIG. 9 ) faces the downstream region of the air passage where the oxygen partial pressure is low, while the downstream region of the fuel-gas passage where the hydrogen partial pressure is low faces the upstream region of the air passage where the oxygen partial pressure is high, whereby reactions uniformly occur throughout the membrane electrode assembly 20.
  • the air-side electrode porous passage portion 14av1 of the first modification example shown in FIG. 1 provides an effect of reducing the difference in the oxygen partial pressure in the air supplied to the upstream region and the oxygen partial pressure in the air supplied to the downstream region, and therefore it solves the foregoing problem.
  • air needs to be discharged in the structures of the example embodiment and its modification examples described above, there is a trade-off between the power needed to supply air to each fuel cell and the uniformity in the oxygen partial pressure in air supplied.
  • the management of water in the air passages influences, via reverse dispersion of water, the fuel-gas passages, and therefore the air passages are preferably designed in consideration of possible influences of the air passages on the fuel-gas passages.
  • the designing of the air passages is especially important.
  • the flooding of water at the oxdizing gas side electrode is effectively prevented by increasing the drainability of exhaust water, or a relatively uniform reverse dispersion of water is accomplished on the fuel-gas passage side
  • the multi-layer structure of the hydrogen-side electrode 22v3 of the third modification example may be applied to the air-side electrode layer 24.
  • the gas diffusion layer of the hydrogen-side electrode 22v2 has a three-layer structure, and the water repellencies of the materials of the three layers are set so as to increase in steps toward the electrolyte membrane 23 or the hydrophilicities of the materials of the three layers are set so as to decrease in steps toward the electrolyte membrane 23. Even when applied to the air-side electrode layer 24, this structure effectively disperses the exhaust water discharged from the electrolyte membrane 23 and thus prevents the flooding of exhaust water.
  • the gas diffusion layer of the electrolyte membrane 23 may alternatively be, for example, a porous portion having a single layer or three or more layers in which the hydrophilicity, or the like, varies.
  • the water repellency, the hydrophilicity, and the density of the gas diffusion layer may be set in various combinations as needed to achieve a desired effect.
  • FIG. 36 is a view showing the fuel-gas supply plate 21v5 of the fifth modification example. If the fuel-gas supply plate 21v5 is provided in any of the structures according to the example embodiment and its modification examples described above, a new process for mounting the fuel-gas supply plate 21v5 needs to be added. In view of this, in the fifth modification example, the edges of the fuel-gas supply plate 21v5 are bent so as to enable easy positioning of the fuel-gas supply plate 21v5 when mounting it during assembly of the fuel cell stack.
  • FIG. 37 is a view showing a fuel-gas supply plate 21v6 of the sixth modification example.
  • the hydrogen-side electrode layer 22 has two positioning pins 22ref1, 22ref2 that are provided in the fuel-gas passage, and positioning pin holes 21ref1, 21ref2 are formed in the fuel-gas supply plate 21v6, and positioning pin holes 14ref1, 14ref2 are formed in the hydrogen-side porous passage portion 14hv6.
  • the two positioning pins 22ref1, 22ref2 are provided in the fuel-gas passage, and this disagrees with the common technical knowledge that positioning pins should be provided outside the fuel-gas passage, which was believed appropriate at the time of filing this application.
  • the inventors examined the above-described structures and focused on the fact that, in said structures, leaks occur only between portions where fuel gas flow and therefore they judged that no significant problem would result from said structures. As a result, positioning pins provided outside of the fuel-gas passage can be removed, and the size and weight of each fuel cell can be reduced accordingly.
  • the invention may optionally incorporate the following structures and features.
  • the invention is applied to solid polymer fuel cells in the foregoing example embodiment, the invention may be applied also to various other fuel cells, such as solid oxide fuel cells, molten carbonate fuel cells, and phosphoric acid fuel cell systems.
  • solid oxide fuel cells such as solid oxide fuel cells, molten carbonate fuel cells, and phosphoric acid fuel cell systems.
  • molten carbonate fuel cells such as molten carbonate fuel cells
  • phosphoric acid fuel cell systems such as tungsten carbonate fuel cells
  • the inventors found that the above-described significant effectsmay be obtained by solid polymer electrolyte fuel cells.
  • reformation gas containing said impurities may be used as fuel gas.
  • an aspect of the invention relates to a fuel cell using air as oxidizing gas and having: an anode provided on an outer face of an electrolyte membrane on one side thereof and having a gas diffusibility; a cathode provided on an outer face of the electrolyte membrane on the other side thereof and having a gas diffusibility; a conductive sheet portion provided adjacent to an outer face of the anode, which has a gas impermeability, a sheet-like shape, and a plurality of through holes that spread two-dimensionally along a horizontal plane of the conductive sheet portion; a conductive porous portion provided adjacent to an outer face of the conductive sheet portion and forming a fuel-gas supply passage through which fuel gas is dispersedly distributed in directions along the horizontal plane of the conductive sheet portion; and a separator provided adjacent to an outer face of the conductive porous portion.
  • the conductive sheet portion inhibits the gas leaking from the cathode side to the anode side from entering the conductive porous portion, so that the supplied fuel gas is dispersed.
  • the power generation efficiency of the entire fuel cell improves.
  • one of the pressure at which fuel gas is supplied to the gas supply passage and the pressure at which oxidizing gas is supplied to the cathode is set such that the minimum value of the pressure of fuel gas flowing in the fuel-gas supply passage is larger than the maximum value of the partial pressure of leak gas leaking to the anode from the oxidizing gas in the cathode through the electrolyte membrane.
  • the nitrogen leaking to the anode is more effectively prevented from flowing into the conductive porous portion via the through holes in the conductive sheet portion.
  • the anode is provided adjacent the conductive sheet portion and the anode has a gas diffusion layer having a gas flow resistance lower than the conductive porous portion.
  • This structure facilitates the dispersion of the fuel gas supplied to the anode through the through holes of the conductive sheet portion, so that the fuel gas disperses throughout the entire anode.
  • the fuel gas supplied to the anode should not be discharged to the outside at least during the normal power generation of the fuel cell.
  • the anode side may have a closed structure that does not discharge fuel gas from the anode to the outside.
  • a metal material is plated to the surface of the conductive sheet portion on the conductive porous portion side or a polymer conductive paste is impregnated to said surface of the conductive sheet portion, and the through holes are formed in said surface.
  • the contact resistance between the conductive sheet and the conductive porous portion decreases.
  • the cathode has an oxidizing-gas supply hole via which oxidizing gas is supplied to the cathode and an oxidizing-gas discharge hole via which oxidizing gas is discharged after used for electrochemical reactions at the cathode
  • the through holes in the conductive sheet portion are differently sized depending upon their relative distances to the oxidizing-gas supply hole or to the oxidizing-gas discharge hole such that the through hole or holes close to the oxidizing-gas supply hole are smaller in diameter than the through hole or holes close to the oxidizing-gas discharge hole.
  • the through holes in the region of the conductive sheet portion corresponding to the portion of the anode where the leak gas partial pressure is high are relatively small in diameter, the flow speed of the fuel gas in said region of the conductive sheet portion is high, whereby the leak gas is prevented from flowing into the conductive porous portion.
  • the through holes in the region of the conductive sheet portion corresponding to the portion of the anode where the leak gas partial pressure is low are relatively large in diameter, the exhaust water leaking from the cathode to the anode can be drained to the conductive porous portion via the through holes.
  • the separator is constituted of a plurality of conductive plates stacked on top of each other and one of the conductive plates has a fuel-gas supply hole through which fuel gas is supplied to the surface of the conductive porous portion in a direction substantially perpendicular to the surface of the conductive porous portion, and a coolant passage is provided in the separator.
  • the invention can be embodied as a method invention including various fuel cell manufacturing methods, as well as a structure invention such as fuel cells as those described above.
  • FIG. 38 is a view showing the exterior of the fuel cell unit 100s of the example embodiment
  • FIG. 39 is a side view of the fuel cell unit 100s.
  • the fuel cell unit 100s has a stack structure constituted of seal-integrated power generation assemblies 200s and separators 600s that are alternately stacked.
  • a given number of seal-integrated power generation assemblies 200s and a given number of separators 600s are stacked on top of each other, and then they are clamped in their stacking direction at a given clamping pressure.
  • seal-integrated power generation assemblies 200s and the separators 600s show spaces between the seal-integrated power generation assemblies 200s and the separators 600s, these spaces do no exist in the actual structure, that is, the seal-integrated power generation assemblies 200s and the separators 600s are in contact with each other.
  • the direction in which the seal-integrated power generation assemblies 200s and the separators 600 are stacked will be referred to as "stacking direction" where necessary.
  • Sealers 700s ribs 720s
  • the fuel cell unit 100s has an oxidizing-gas supply manifold 110s for supplying oxidizing gas, an oxidizing-gas discharge manifold 120s for discharging oxidizing gas, a fuel-gas supply manifold 130s for supplying fuel gas, and a coolant supply manifold 150s for supplying coolant, and a coolant discharge manifold 160s for discharging coolant.
  • the fuel cell unit 100s is structured not to discharge fuel gas from the anode side, that is, the fuel cell unit 100s has a closed structure that does not discharge fuel gas from the anode to the outside. This structure will hereinafter be referred to as "anode dead-end structure" where necessary.
  • the fuel cell unit 100s does not have any manifold for discharging fuel gas.
  • air is used as oxidizing gas
  • hydrogen is used as fuel gas.
  • Antifreeze liquid e.g., water, ethylene glycol), air, or the like, may be used as coolant. Further, gas obtained by adding high-concentration oxygen into air may be used as oxidizing gas.
  • FIG. 40 is an elevation view of the seal-integrated power generation assembly 200s (a view of each seal-integrated power generation assembly 200s seen from the right side in FIG. 39 ).
  • FIG. 41 is a cross-sectional view taken along the line A-A in FIG. 40 .
  • FIG. 41 shows, as well as the seal-integrated power generation assembly 200s, two separators 600 that are provided on both sides of the seal-integrated power generation assembly 200s when the fuel cell unit 100s is assembled.
  • the seal-integrated power generation assembly 200s is constituted of a stack portion 800s and the sealer 700s.
  • the stack portion 800s has a MEA 24s, a conductive sheet 860s characterizing the invention, an anode-side porous portion 840s, and a cathode-side porous portion 850s.
  • the MEA 24s has an electrolyte membrane 810s, an anode 820s, and a cathode 830s.
  • the electrolyte membrane 810s is made of, for example, a fluorine resin or a hydrocarbon resin and exhibits a high ion conductivity in a wet condition.
  • the anode 820s is constituted of a catalyst layer 820As provided on one side of the electrolyte membrane 810s and an anode-side diffusion layer 820Bs provided on the outer side of the catalyst layer 820As.
  • the cathode 830s is constituted of a catalyst layer 830As provided on the other side of the electrolyte membrane 810s and a cathode-side diffusion layer 830Bs provided on the outer side of the catalyst layer 830As.
  • the catalyst layers 820As, 830As are each formed of, for example, electrolyte and catalyst carriers (e.g., platinum-carrying carbon) on each of which catalyst (e.g., platinum) is supported.
  • the anode-side diffusion layer 820Bs and the cathode-side diffusion layer 830Bs are each formed of, for example, carbon cloth woven from carbon fiber threads, carbon papers, or carbon felts.
  • the MEA 24s is rectangular.
  • the anode-side porous portion 840s and the cathode-side porous portion 850s are each made of a porous material having a gas diffusibility and a conductivity, such as porous metal. For example, expanded metal, perforated metal, meshes, felts, etc., are used. Further, the anode-side porous portion 840s and the cathode-side porous portion 850s contact power generation regions DA of the separators 600s, which will be described later, when the seal-integrated power generation assemblies 200s and the separators 600s are stacked to form the fuel cell unit 100s.
  • the anode-side porous portion 840s serves as a fuel-gas supply passage for supplying fuel gas to the anode 820s as will be described later
  • the cathode-side porous portion 850s serves as an oxidizing-gas supply passage for supplying oxidizing gas to the cathode 830s as will be described later.
  • the gas flow resistance of the anode-side diffusion layer 820Bs is lower than that of the anode-side porous portion 840s and the gas flow resistance of the cathode-side diffusion layer 830Bs is lower than that of the cathode-side porous portion 850s.
  • FIG. 42 is an elevation view of the conductive sheet 860s that characterizes the invention (a view of the conductive sheet 860s seen from the upper side in FIG. 41 ).
  • the conductive sheet 860s is formed in a sheet-like shape (a thin membrane shape), and a number of through holes 865s are formed in the conductive sheet 860s so as to spread two-dimensionally.
  • Each through hole 865s is circular and has a common diameter (that is, each through hole 865 has common shape and size).
  • the through holes 865s are arranged in a staggered pattern.
  • the conductive sheet 860s is made of gold and is joined to one side of the anode-side porous portion 840s by thermal-compression bonding, soldering, welding, or the like. Note that the through holes 865s of the conductive sheet 860s may be arranged in a grid pattern.
  • the sealer 700s is provided at the outer periphery of the stack portion 800s along the plane thereof (will be referred to as "planar direction").
  • the sealer 700s is manufactured by setting the stack portion 800s on a mold such that the outer peripheral end face of the stack portion 800s faces the cavity of the mold and then injecting material into the cavity. As such, the sealer 700s is formed so as to surround the outer periphery of the stack portion 800s air-tightly with no gaps therebetween.
  • the sealer 700s is made of a material that is gas-impermeable and elastic and exhibits a high thermal resistance within the operation temperature range of the fuel cell unit, such as rubber and elastomer.
  • silicon rubber butyl rubber, acrylic rubber, natural rubber, fluorine rubber, ethylene propylene rubber, styrene elastomer, fluorine elastomer, etc. may be used as the material of the sealer 700s.
  • the sealer 700s has a support portion 710s and ribs 720s provided on the both sides of the support portion 710s and forming a seal line.
  • through holes are formed in the support portion 710s. These through holes form the manifolds 120s to 150s, respectively (Refer to FIG. 38 ).
  • each rib 720s sticks to the adjacent separator 600s and thus seals between the seal-integrated power generation assembly 200s and the separator 600s, preventing leaks of the reaction gas and the coolant.
  • the rib 720s forms a seal line surrounding the stack portion 800s entirely and seal lines surrounding the respective manifold holes entirely as shown in FIG. 40 .
  • FIG. 43 is a view showing the shape of a cathode plate 400s of the separator 600s.
  • FIG. 44 is a view showing the shape of an anode plate 300s of the separator 600s.
  • FIG. 45 is a view showing the shape of an intermediate plate 500s of the separator 600s.
  • FIG. 46 is an elevation view of the separator 600s.
  • the separator 600s is constituted of the cathode plate 400s, the anode plate 300s, and the intermediate plate 500s shown in FIG. 43 , FIG. 44 , and FIG. 45 , respectively.
  • FIG. 43 , FIG. 44 , FIG. 45 , and FIG. 46 show views of the cathode plate 400s, the anode plate 300s, the intermediate plate 500s, and the separator 600s seen from the right side in FIG. 9 .
  • the black and white arrows in FIG. 46 will be later explained.
  • a region DA that faces the air-side electrode layer 24 of the stack portion 800s of the seal-integrated power generation assembly 200s when the separators 600s and the seal-integrated power generation assemblies 200s are stacked to form the fuel cell unit 100s. Because the region DA is where power generation is performed, this region will hereinafter be referred to as "power generation region DA". Since the MEA 24s is rectangular, the power generation region DA is rectangular naturally. Referring to FIG. 43 to FIG.
  • the side S1 of the power generation region DA on the upper side will be referred to as "first side”
  • the side S2 on the right side will be referred to as “second side”
  • the side S3 on the lower side will be referred to as “third side”
  • the side S4 on the left side will be referred to as "fourth side”.
  • the first side S1 and the third side S3 are opposite to each other
  • the second side S2 and the fourth side S4 are also opposite to each other.
  • the first side S1 and the second side S2 are adjacent to each other.
  • the second side S2 and the third side S3, the third side S3 and the fourth side S4, and the fourth side S4 and the first side S1 are adjacent to each other.
  • the cathode plate 400s ( FIG. 43 ) is made of, for example, stainless steel.
  • the cathode plate 400s has five manifold openings 422s to 432s, an oxidizing-gas supply slit 440s, and an oxidizing-gas discharge slit 444s.
  • the manifold openings 422s to 432s form the above-described manifolds in the fuel cell unit 100s, respectively.
  • the manifold openings 422s to 432s are arranged on the respective outer sides of the power generation region DA.
  • the oxidizing-gas supply slit 440s is an oblong opening having a substantially rectangular cross section and formed in the power generation region DA along the first side S1.
  • the oxidizing-gas supply slit 440s extends almost the entire length of the first side S 1.
  • the oxidizing-gas discharge slit 444s is an oblong opening having a substantially rectangular cross section and formed in the power generation region DA along the third side S3.
  • the oxidizing-gas discharge slit 444s extends almost the entire length of the third side S3.
  • the anode plate 300s ( FIG. 44 ) is made of, for example, stainless steel.
  • the anode plate 300s has five manifold openings 322s to 332s and a fuel-gas supply slit 350s.
  • the manifold openings 322s to 332s form the above-described manifolds in the fuel cell unit 100s, respectively.
  • the manifold openings 322s to 332s are arranged on the respective outer sides of the power generation region DA.
  • the fuel-gas supply slit 350s is formed in the power generation region DA along the third side S3 at such a position that, when the separator 600s is assembled, the fuel-gas supply slit 350s does not overlap the oxidizing-gas discharge slit 444s of the cathode plate 400s.
  • the intermediate plate 500s ( FIG. 45 ) is made of, for example, stainless steel.
  • the intermediate plate 500s has three manifold openings 522s to 526s for supplying and discharging the reaction gases (oxidizing gas and fuel gas), a plurality of oxidizing-gas distribution passage openings 542s, a plurality of oxidizing-gas discharge passage openings 544s, and a single fuel-gas distribution passage opening 546s. Further, the intermediate plate 500s has a plurality of coolant passage openings 550s.
  • the manifold openings 522s to 528s form the above-described manifolds in the fuel cell stack 100, respectively.
  • the manifold openings 522s to 528s are arranged on the respective outer sides of the power generation region DA.
  • Each coolant passage opening 550s is oblong penetrating the power generation region DA in the horizontal direction of FIG. 45 , and the both ends of the coolant passage opening 550s are located outside of the power generation region DA. That is, each coolant passage opening 550s extends across the second side S2 and the fourth side S4 of the power generation region DA.
  • the coolant passage openings 550s are arranged at given intervals in the vertical direction of FIG. 45 .
  • the oxidizing-gas distribution passage openings 542s communicate, on one side, with the manifold opening 522s, whereby the oxidizing-gas distribution passage openings 542s and the manifold opening 522s together form a pectinate through hole.
  • the oxidizing-gas distribution passage openings 542s communicate with the oxidizing-gas supply slit 440s in the assembled separator 600s.
  • the oxidizing-gas discharge passage openings 544s communicate, on one side, with the manifold opening 524s, whereby the oxidizing-gas discharge passage openings 544s and the manifold opening 524s together form a pectinate through hole.
  • the oxidizing-gas discharge passage openings 544s communicate with the oxidizing-gas discharge slit 444s in the assembled separator 600s.
  • the fuel-gas distribution passage opening 546s extends, on one side thereof, across the second side S2 and along the third side S3 at a position not overlapping the oxidizing-gas discharge passage openings 544s, and the end of the fuel-gas distribution passage opening 546s on the same side is located near the fourth side S4. That is, the fuel-gas distribution passage opening 546s extends substantially the entire length of the third side S3.
  • the fuel-gas distribution passage opening 546s communicates with the fuel-gas supply slit 350s in the assembled separator 600s.
  • Each separator 600s ( FIG. 46 ) is assembled by joining the anode plate 300s, the cathode plate 400s, and the intermediate plate 500s such that the intermediate plate 500s is sandwiched between the anode plate 300s and the cathode plate 400s and then punching through the exposed portions at the regions corresponding to the coolant supply manifold 150s and the coolant discharge manifold 160s of the intermediate plate 500s, respectively.
  • the three plates can be joined together by, for example, thermal-compression bonding, soldering, welding, or the like. This is how to manufacture the separators 600s each having the five manifolds 110s to 160s that are the through holes hatched in FIG. 46 , a plurality of oxidizing-gas distribution passages 650s, a plurality of oxidizing-gas discharge passages 660s, a fuel-gas distribution passage 630s, and a plurality of coolant passages 670s.
  • each oxidizing-gas distribution passage 650s is defined by the oxidizing-gas supply slit 440s of the cathode plate 400s and the corresponding one of the oxidizing-gas distribution passage openings 542s of the intermediate plate 500s.
  • Each oxidizing-gas distribution passage 650s is an internal passage extending in the separator 600s, and one end of which communicates with the oxidizing-gas supply manifold 110s and the other end leads to the surface of the cathode plate 400s on the other side thereof. Further, as shown in FIG.
  • each oxidizing-gas discharge passage 660s is defined by the oxidizing-gas discharge slit 444s of the cathode plate 400s and the corresponding one of the oxidizing-gas discharge passage openings 544s of the intermediate plate 500s.
  • Each oxidizing-gas discharge passage 660s is an internal passage extending in the separator 600s, and one end of which communicates with the oxidizing-gas discharge manifold 120s and the other end leads to the surface of the cathode plate 400s on the other side thereof.
  • the fuel-gas distribution passage 630s is defined by the fuel-gas supply slit 350s of the anode plate 300s and the fuel-gas distribution passage opening 546s of the intermediate plate 500s.
  • the fuel-gas distribution passage 630s is an internal passage communicating at one end with the fuel-gas supply manifold 130s and leading at the other end to the surface of the anode plate 300s on the other side.
  • the coolant passages 670s are defined by the coolant passage openings 550s of the intermediate plate 500s ( FIG. 45 ). Each coolant passage 670s communicates at one end with the coolant supply manifold 150s and at other end with the coolant discharge manifold 160s.
  • FIG. 47 is a view showing the reaction gas flows in the fuel cell unit 100s of the example embodiment.
  • FIG. 48 is an enlarged view of the region X shown in FIG. 47 .
  • FIG. 47 only shows two seal-integrated power generation assemblies 200s and two separators 600s, which are stacked.
  • FIG. 47A shows a cross section taken along the line B-B in FIG. 46 .
  • the right side of FIG. 47B shows a cross section taken along the line D-D in FIG. 46 while the left side shows a cross section taken along the line C-C in FIG. 46 .
  • the arrows in FIG. 47 and FIG. 48 indicate the reaction gas flows.
  • the fuel cell unit 100s generates power in response to oxidizing gas being supplied to the oxidizing-gas supply manifold 110s and fuel gas being supplied to the fuel-gas supply manifold 130s.
  • the heat generated by the power generation raises the temperature of the fuel cell unit 100s, and therefore coolant is supplied to the coolant supply manifold 150s to suppress the increase in the temperature of the fuel cell unit 100s.
  • the coolant supplied to the coolant supply manifold 150s is delivered to the coolant passage 670s.
  • the coolant supplied to each coolant passage 670s flows from one end to the other end of the coolant passage 670s while performing heat exchange and then it is discharged to the coolant discharge manifold 160s.
  • the oxidizing gas supplied to the oxidizing-gas supply manifold 110s flows through the oxidizing-gas distribution passage 650s and then enters the cathode-side porous portion 850s via the oxidizing-gas supply slit 440s ( FIG. 43 ). After thus entering the cathode-side porous portion 850s, the oxidizing gas flows through the inside of the cathode-side porous portion 850s, which serves as an oxidizing-gas supply passage, from the upper side to the lower side as indicated by the white arrows in FIG. 46 .
  • the oxidizing gas enters the oxidizing-gas discharge passage 660s via the oxidizing-gas discharge slit 444s ( FIG. 43 ), and then the oxidizing gas is discharged to the oxidizing-gas discharge manifold 120s via the oxidizing-gas distribution passage 650s.
  • a portion of the oxidizing gas flowing through the inside of the cathode-side porous portion 850s diffuses throughout the entire portion of the cathode 830s abutting on the cathode-side porous portion 850s and then it is used for cathode reactions (e.g., 2H + + 2e - + (1/2)O 2 ⁇ H 2 O).
  • the fuel gas supplied to the fuel-gas supply manifold 130s flows from the fuel-gas supply manifold 130s to the fuel-gas distribution passage 630s and then enters the anode-side porous portion 840s via the fuel-gas supply slit 350s ( FIG. 44 ). After thus entering the anode-side porous portion 840s, the fuel gas flows through the inside of the anode-side porous portion 840s, which serves an a fuel-gas supply passage, from the lower side to the upper side as indicated by the black arrows in FIG. 46 . At this time, as shown in FIG.
  • the fuel gas enters the anode 820s (an anode-side gas diffusion later 820s) via the through holes 865s of the conductive sheet 860s abutting on the anode-side porous portion 840s and then is used for anode reactions (e.g., H2 ⁇ 2H + 2e - ). Detail on the gas diffusion in the anode-side diffusion layer 820Bs will be later described with reference to FIG. 48 .
  • the fuel cell unit 100s of the example embodiment employs an anode dead-end structure including no fuel-gas discharge passages and outlets, and therefore the fuel gas supplied to the anode-side porous portion 840s is basically consumed at the anode 820s.
  • the pressure at which fuel gas is supplied to the fuel-gas supply passage portion (will be referred to as “fuel-gas supply pressure” where necessary) and the pressure at which oxidizing is supplied to the oxidizing-gas supply passage portion (will be referred to as “oxidizing-gas supply pressure” where necessary) are set such that the minimum value of the pressure of fuel gas flowing in the fuel-gas supply passage portion is larger than the maximum value of the partial pressure of the leak gas at the anode 820s which has leaked from the cathode 830s side through the electrolyte membrane 810s.
  • This requirement may be satisfied by either setting only one of the fuel-gas supply pressure and the oxidizing-gas supply pressure to a given value or setting both of the fuel-gas supply pressure and the oxidizing-gas supply pressure to given values.
  • the set value of the fuel-gas supply pressure and/or the set value of the oxidizing-gas supply pressure are determined based on, for example, particular data empirically obtained.
  • the conductive sheet 860s is provided between the anode 820s (the anode-side diffusion layer 820Bs) and the anode-side porous portion 840s, which inhibits the leak gas from entering the anode-side porous portion 840s (fuel-gas supply passage portion) from the anode-side diffusion layer 820Bs and thus prevents the leak gas from stagnating at the anode-side porous portion 840s (fuel-gas supply passage portion).
  • the through holes 865s are formed in the conductive sheet 860s so as to spread two-dimensionally along the horizontal plane of the conductive sheet 860s.
  • the fuel gas flows into each through hole 865s in the direction perpendicular to the surface of the anode 820s (the anode-side diffusion layer 820Bs), which is the stacking direction, and then enters the anode 820s and disperses throughout the entire anode-side diffusion layer 820Bs, whereby the fuel gas is supplied to the catalyst layer 820As (Refer to FIG. 48 ).
  • the fuel gas supplied to the anode-side porous portion 840s can be dispersedly supplied to the anode 820s and thus power generation can be performed using the entire portion of the anode 820s (the catalyst layer 820As). As such, the power generation efficiency of the fuel cell unit 100s improves.
  • the fuel-gas supply pressure and the oxidizing-gas supply pressure are adjusted such that the minimum value of the pressure of fuel gas flowing in the fuel-gas supply passage portion is larger than the maximum value of the partial pressure of the leak gas at the anode 820s which has leaked from the cathode 830s side via the electrolyte membrane 810s.
  • This arrangement significantly reduces the amount of the leak gas entering the anode-side porous portion 840s from the anode 820s (the anode-side diffusion layer 820Bs) via the through holes 865s of the conductive sheet 860s.
  • the gas flow resistance of the anode-side diffusion layer 820Bs is higher than that of the anode-side porous portion 840s.
  • the fuel gas supplied to the anode-side diffusion layer 820Bs via the through holes 865s of the conductive sheet 860s can be more reliably dispersed throughout the entire portion of the anode-side diffusion layer 820Bs.
  • the anode 820s and the cathode 830s correspond to “anode” and “cathode” in the claims
  • the anode-side diffusion layer 820Bs corresponds to "gas diffusion layer” in the claims
  • the conductive sheet 860s corresponds to "conductive sheet portion” in the claims
  • the through holes 865s correspond to "through hole” in the claims
  • the anode-side porous portion 840s corresponds to "conductive porous portion” in the claims
  • the separators 600s correspond to "separator" in the claims.
  • FIG. 49 is a view showing a conductive sheet 860As of a fuel cell unit according to the first modification example.
  • FIG. 49 is an elevation view of the conductive sheet 860As in a state where the stack portions 800s each including the conductive sheet 860s and the separators 600s are stacked.
  • FIG. 49 only the cathode plate 400s of the separator 600s (broken line) is shown, and other plates of the separator 600s and other stack portions 800s (the anode-side porous portions 840s, etc) are not shown.
  • the through holes 865s of the conductive sheet 860s of the fuel cell unit 100s of the foregoing example embodiment have a common diameter
  • the invention is not limited to this.
  • the through holes 865As of the conductive sheet 860As are formed as follows. Referring to FIG.
  • the through holes 865As are formed such that the larger the relative distance from the oxidizing-gas supply slit 440s (i.e., an oxidizing-gas supply hole for supplying oxidizing gas to the cathode 830s), in other words, the smaller the relative distance to the oxidizing-gas discharge slit 444s (i.e., an oxidizing-gas discharge hole for discharging the oxidizing gas from the cathode 830s), the larger the diameter of the through hole 865As.
  • the through holes 865As are formed such that the closer to the oxidizing-gas supply slit 440s, that is, the higher the leak gas partial pressure at the corresponding portion of the anode 820s, the smaller the diameter of the through hole 865As, and such that the closer to the oxidizing-gas discharge slit 444s (the more distant from the oxidizing-gas supply slit 440s), that is, the lower the leak gas partial pressure at the corresponding portion of the anode 820s, the larger the diameter of the through hole 865s.
  • the fuel gas flow rate at said through holes 865s is relatively high, thus inhibiting the leak gas from entering the anode-side porous portion 840s
  • the diameters of the through holes 865s formed in the portion of the conductive sheet 860As corresponding to the region of the anode 820s where the leak gas partial pressure is low are relatively large, the exhaust water leaking from the cathode 830s to the anode 820s (will be referred to as "leak water” where necessary) can be discharged to the anode-side porous portion 840s via said through holes 865As.
  • the invention is not limited to this. That is, the conductive sheet 860s may be made of various other materials, such as titanium and stainless steel. In this case, the conductive sheet 860s is joined to one side of the anode-side porous portion 840s by thermal-compression bonding, soldering, welding, or the like.
  • the conductive sheet 860s may be made of a conductive polymer paste, such as a silver paste, a carbon paste, and a silver-carbon paste.
  • the formed sheet may be joined to one side of the anode-side porous portion 840s by thermal-compression bonding or the formed sheet may be jointed to the anode-side porous portion 840s in the following method.
  • a conductive polymer paste is prepared, and then the paste is applied to one side of the anode-side porous portion 840s and mildly impregnated into the anode-side porous portion 840s, after which thermal-compression bonding is performed.
  • This method reduces the contact resistance between the conductive sheet 860s and the anode-side porous portion 840s.
  • the through holes 865s are formed (punched) using a pinholder-like tool, for example.
  • the through holes 865s may be formed using a mold having a plurality of projections. In this case, the projections of the mold form the through holes 865s.
  • the conductive sheet 860s may be joined to the anode-side porous portion 840s using a metal material (e.g., gold), which will referred to as "material M", in the following method.
  • a metal material e.g., gold
  • the material M is first prepared, and then it is plated to one side of the anode-side porous portion 840s. This reduces the contact resistance between the conductive sheet 860s and the anode-side porous portion 840s.
  • the corresponding surface of the anode-side porous portion 840s may be masked in advance. In this case, the through holes 865s are formed by removing the mask from the anode-side porous portion 840s after the plating of the material M.
  • separators 600s are each constituted of the three metal plates stacked and have flat surfaces in the fuel cell unit 100s of the foregoing example embodiment, the separators 600s may have various other structures and various other shapes.
  • each stack portion 800s and the respective parts and portions of each separator 600s have been specified in the foregoing example embodiment, they are only exemplary. That is, various other materials may be used.
  • the anode-side porous portion 840s and the cathode-side porous portion 850s are made of porous metal material in the foregoing example embodiment, they may alternatively be made of other materials such as porous carbon materials.
  • the separators 600s are made of metal in the foregoing example embodiment, they may alternatively be made of other materials such as carbon.
  • the fuel cell unit 100s of the foregoing example embodiment has a closed structure that does not discharge the fuel gas from the anode to the outside (anode dead-end structure), the invention is not limited to this.
  • the fuel cell unit 100s may have holes, passages, and manifolds for discharging fuel gas.
  • a check valve that checks the fuel gas discharged from a fuel-gas discharge manifold (will be referred to as "check valve N") is provided outside of the fuel cell unit 100s, and the check valve N is closed at least during the normal power generation of the fuel cell unit 100s so that the fuel gas supplied to the anode 820s is not discharged to the outside. Irrespective of such modifications, the effects obtained by the fuel cell unit 100s are substantially the same as those described above.

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Claims (23)

  1. Brennstoffzelle in Form einer Festpolymer-Brennstoffzelle, aufweisend:
    einen Elektrolyten (23; 810s);
    eine Anode (22; 22v1; 22v2; 22v3; 22v4; 22v5; 22v6; 820s), die auf einer Seite des Elektrolyten (23; 810s) angeordnet und eine Wasserstoffgas verbrauchende Fläche aufweist, an der ein Wasserstoffgas verbraucht wird;
    eine Kathode (24; 830s), die auf der anderen Seite des Elektrolyten (23; 810s) angeordnet ist und eine Oxidationsgas verbrauchende Fläche aufweist, auf der ein Oxidationsgas verbraucht wird;
    einen ersten Separator (43, 600s), der benachbart zu der Wasserstoffgas verbrauchenden Fläche angeordnet ist;
    einen zweiten Separator (41, 600s), die benachbart zu der Oxidationsgas verbrauchenden Fläche angeordnet ist;
    einen Wasserstoffgasleitungsabschnitt, der eine Leitung ausbildet, durch die Wasserstoffgas vorbestimmten Bereichen der Wasserstoffgas verbrauchenden Fläche der Anode (22; 22v1; 22v2; 22v3; 22v4; 22v5; 22v6; 820s) zugeführt wird, wobei
    die Brennstoffzelle (100n; 100s) eine Anoden-Umkehrendstruktur aufweist, die dadurch gekennzeichnet ist, dass der Wasserstoffgasleitungsabschnitt aufweist:
    eine Brenngaszuführplatte, die als ein Rückwärtsströmungs-Verhinderungsabschnitt (21 n; 860s) fungiert und eine Mehrzahl von Durchgangslöchern(211n; 211 v2; 211v3; 211v4; 865s; 865As) aufweist,
    wobei die Brenngaszuführplatte oder der Rückwärtsströmungs-Verhinderungsabschnitt (21n, 860s) zwischen dem ersten Separator (43) und der Anode (22; 22v1; 22v2; 22v3; 22v4; 22v5; 22v6; 820s) angeordnet sind;
    einen ersten Leitungsabschnitt (14h; 14hv1; 14hv3; 14hv6), der zwischen einer ersten Seite der Brenngaszuführplatte (21n,; 860s) und dem ersten Separator (43) angeordnet ist; und
    einen zweiten Leitungsabschnitt (14a; 14av1; 14av2; 14av3; 14av4), der an der anderen, zweiten Seite der Brenngaszuführplatte angeordnet ist;
    wobei der erste Leitungsabschnitt (14h; 14hv1) und der zweite Leitungsabschnitt (14a; 14av1) jeweils einen porösen Abschnitt aufweisen, der in Bezug auf ein Wasserstoffgas durchlässig ist; und wobei ein Druckverlust pro Längeneinheit des porösen Abschnitts des zweiten Leitungsabschnitts (14a; 14av1) geringer ist als ein Druckverlust pro Längeneinheit des porösen Abschnitts des ersten Leitungsabschnitts (14h; 14hvl).
  2. Brennstoffzelle nach Anspruch 1, wobei
    der erste Leitungsabschnitt (14h; 14hv1; 14hv3; 14hv6) ein Leitungsabschnitt ist, durch den das Wasserstoffgas in Richtung auf die vorbestimmten Bereiche der Wasserstoffgas verbrauchenden Fläche der Anode (22; 22v1; 22v2; 22v3; 22v4; 22v5; 22v6; 820s) verteilt wird; der zweite Leitungsabschnitt (14a; 14av1; 14av2; 14av3; 14av4) ein Abschnitt ist, durch den die verteilten Gase den vorbestimmten Bereichen der Wasserstoffgas verbrauchenden Fläche der Anode (22; 22v1; 22v2; 22v3; 22v4; 22v5; 22v6; 820s) jeweils zugeführt werden; und der Rückwärtsströmungs-Verhinderungsabschnitt (21n; 860s) ein Abschnitt ist, der eine Rückwärtsströmung von dem zweiten Leitungsabschnitt (14a; 14av1; 14av2; 14av3; 14av4) zu dem ersten Leitungsabschnitt (14h; 14hv1; 14hv3; 14hv6) verhindert.
  3. Brennstoffzelle nach Anspruch 2, wobei
    der Rückwärtsströmungs-Verhinderungsabschnitt (21n; 860s) Wasserstoffgas mit einer Strömungsrate zuführt, die größer oder gleich einer Strömungsrate ist, die basierend auf einer Diffusionsrate von Stickstoff in einem gegebenen Betriebszustand der Brennstoffzelle (100n; 100s) vorbestimmt wird.
  4. Brennstoffzelle nach Anspruch 1, wobei
    der zweite Leitungsabschnitt (14a; 14av1; 14av2; 14av3; 14av4) eine Mehrzahl von Löchern aufweist, die mit zumindest einem von den Durchgangslöchern (211n) des Rückwärtsströmungs-Verhinderungsabschnitts (21n) kommunizieren.
  5. Brennstoffzelle nach Anspruch 4, wobei
    ein Positionierungselement (Cg) zum Definieren einer Positionsbeziehung zwischen den Durchgangslöchern (211n) des Rückwärtsströmungs-Verhinderungsabschnitts (21n) und den Löchern des zweiten Leitungsabschnitts (14a; 14av1; 14av2; 14av3; 14av4) an zumindest einem von den Durchgangslöchern (211n) des Rückwärtsströmungs-Verhinderungsabschnitts (21n) angeordnet ist.
  6. Brennstoffzelle nach einem der Ansprüche 1 bis 5, wobei
    die wasserabweisenden Eigenschaften des zweiten Leitungsabschnitts (14a; 14av1; 14av2; 14av3; 14av4) in Richtung auf den Elektrolyt (23) in einer Richtung zunehmen, in der die Komponenten der Brennstoffzelle (100n) gestapelt sind.
  7. Brennstoffzelle nach einem der Ansprüche 1 bis 6, wobei
    die hydrophilen Eigenschaften des zweiten Leitungsabschnitts (14a; 14a1, 14av2; 14av3; 14av4) in Richtung auf die von dem Elektrolyt (23) entfernte Seite in einer Richtung zunehmen, in der die Komponenten der Brennstoffzelle (100n) gestapelt sind.
  8. Brennstoffzelle nach einem der Ansprüche 1 bis 7, wobei
    der zweite Leitungsabschnitt (14a; 14av1; 14av2; 14av3; 14av4) aus einem porösen Material gebildet ist, dessen Dichte in Richtung auf die von dem Elektrolyt (23) abgewandte Seite in einer Richtung zunimmt, in der die Komponenten der Brennstoffzelle (100n) gestapelt sind.
  9. Brennstoffzelle nach einem der Ansprüche 1 bis 8, wobei das Oxidationsgas Luft enthält, wobei
    die Anode (820s) auf einer äußeren Fläche des Elektrolyts (810s) auf einer Seite desselben angeordnet ist und ein Gasdiffusionsvermögen aufweist, wobei die Kathode (830s) auf einer äußeren Fläche des Elektrolyts (810s) auf der anderen Seite desselben angeordnet ist und ein Gasdiffusionsvermögen aufweist, wobei die Brennstoffzelle (100s) ferner aufweist:
    einen leitfähigen Lagenabschnitt (860s), der benachbart zu einer äußeren Fläche der Anode (820s) angeordnet ist, der gasundurchlässig ist, eine lagenförmige Form und eine Mehrzahl von Durchgangslöchern (865s; 865As) aufweist, die sich entlang einer horizontalen Ebene des leitfähigen Lagenabschnitts (860s) zweidimensional ausbreiten;
    einen leitfähigen porösen Abschnitt (840s), der benachbart zu einer äußeren Fläche des leitfähigen Lagenabschnitts (860s) angeordnet ist und eine Wasserstoffgas-Zuführleitung (840s) ausbildet, durch die Wasserstoffgas in Richtungen entlang der horizontalen Ebene des leitfähigen Lagenabschnitts (860s) dispergiert verteilt wird; und
    einen Separator (600s), der benachbart zu einer äußeren Fläche des leitfähigen porösen Abschnitts (840s) angeordnet ist.
  10. Brennstoffzelle nach Anspruch 9, wobei
    der Durchmesser eines ersten Durchgangslochs (865s) von den Durchgangslöchern (865As) des leitfähigen Lagenabschnitts (860As) größer ist als der Durchmesser eines zweiten Durchgangslochs (865As), das einem Oxidationsgas-Zuführloch (440s) zum Zuführen von Oxidationsgas zu der Kathode (830s) näher ist als das erste Durchgangsloch (865As).
  11. Brennstoffzelle nach einem der Ansprüche 1 bis 10, wobei
    die Oxidationsgas verbrauchende Fläche der Kathode (24) eine Mehrzahl von Nuten (14ag1) aufweist, durch die der Oxidationsgas verbrauchenden Fläche (24n) Oxidationsgas zugeführt wird.
  12. Brennstoffzelle nach einem der Ansprüche 1 bis 11, wobei
    eine Wasserrückhaltenut (14agv1, 14agv2) an einer Position nahe einer Leitung zum Abführen von Oxidationsgas und neben der Oxidationsgas verbrauchenden Fläche (24n) der Kathode (24) angeordnet ist.
  13. Brennstoffzelle nach Anspruch 1, wobei
    das Wasserstoffgas durch den Wasserstoffgas-Leitungsabschnitt den vorbestimmten Bereichen in einer Richtung zugeführt wird, die die Wasserstoffgas verbrauchende Fläche der Anode (22; 22v1; 22v2; 22v3; 22v4; 22v5; 22v6; 820s) schneidet.
  14. Brennstoffzelle nach Anspruch 13, wobei
    der erste Leitungsabschnitt (14h, 14hv1; 14hv3; 14hv6) von der Wasserstoffgas verbrauchenden Fläche der Anode (22; 22v1; 22v2; 22v3; 22v4; 22v5; 22v6; 820s) abgetrennt ist.
  15. Brennstoffzelle nach Anspruch 1, wobei
    die Brennstoffzelle (100n) keinen Verteiler zum Abführen von Wasserstoffgas aufweist.
  16. Brennstoffzelle nach Anspruche 1, ferner aufweisend:
    einen Verteiler (227) zum Abführen von Wasserstoffgas, wobei der Verteiler (227) während einer normalen Leistungserzeugung der Brennstoffzelle (100n) geschlossen ist.
  17. Brennstoffzelle nach Anspruch 1, wobei
    die Wasserstoffgaszuführplatte(21n; 860s), die als ein Rückwärtsströmungs-Verhinderungsabschnitt (21n, 860s) fungiert, neben einer Fläche der Anode (22; 22v1; 22v2; 22v3; 22v4; 22v5; 22v6; 820s) angeordnet ist, die einer Fläche der Anode (22; 22v1; 22v2; 22v3; 22v4; 22v5; 22v6; 820s) neben dem Elektrolyten (23; 810s) gegenüberliegt, wobei die Wasserstoffgaszuführplatte (21n; 860s) gasundurchlässige Eigenschaften, eine lagenartige Form und eine Mehrzahl von Durchgangslöchern (211n; 211 v2; 211 v3; 211 v4; 865s; 865As), die sich entlang einer horizontalen Ebene der Wasserstoffgaszuführplatte (21n; 860s) zweidimensional ausbreiten, aufweist, und
    einen leitfähigen porösen Abschnitt (14h, 14hv1; 14hv3; 14hv6; 840s), der neben einer Fläche der Wasserstoffgaszuführplatte (21n; 860s) angeordnet ist, die einer Fläche der Wasserstoffgaszuführplatte (21n; 860s) neben der Anode (22; 22v1; 22v2; 22v3; 22v4; 22v5; 22v6; 820s) gegenüberliegt, und die den Wasserstoffgas-Leitungsabschnitt ausbildet, durch den Wasserstoffgas in Richtungen entlang der horizontalen Ebene der Wasserstoffgaszuführplatte (21n; 860s) dispergiert verteilt wird.
  18. Brennstoffzelle nach Anspruch 1, wobei
    die Wasserstoffgaszuführplatte (21n; 860s) eine Metallplatte (21n) ist, die neben einer Fläche der Anode (22; 22v1; 22v2; 22v3; 22v4; 22v5; 22v6; 820s) angeordnet ist, die einer Fläche der Anode (22; 22v1; 22v2; 22v3; 22v4; 22v5; 22v6; 820s) benachbart zu dem Elektrolyt (23; 810s) gegenüberliegt und gasundurchlässig ist, eine lagenartige Form und eine Mehrzahl von Durchgangslöchern (211n; 211v2; 211v3; 211v4; 865s; 865As) aufweist, die sich entlang einer horizontalen Ebene der Metallplatte (21 n) zweidimensional ausbreiten.
  19. Brennstoffzelle nach Anspruch 18, ferner aufweisend eine Dichtung (14hg, 52n), die einen Endabschnitt der Anode (22; 22v1; 22v2; 22v3; 22v4; 22v5; 22v6; 820s) umgibt, die aus einem Material gefertigt ist, das steifer ist als das Material der Anode (22; 22v1; 22v2; 22v3; 22v4; 22v5; 22v6;
    820s) gegenüber einer Druckkraft, die auf ihre Dicke einwirkt.
  20. Brennstoffzelle nach Anspruch 1, wobei
    der Oxidationsgas-Leitungsabschnitt eine Leitung ist, durch die der Oxidationsgas verbrauchenden Fläche Oxidationsgas zugeführt wird;
    wobei ein Dichtmittel (700s) zwischen dem ersten Separator (600s) und dem zweiten Separator (600s) angeordnet ist, das an dem ersten Separator (600s) und dem zweiten Separator (600s) haftet, so dass das Dichtmittel (700s) zwischen dem Dichtmittel (700s) und dem ersten Separator (600s) und zwischen dem Dichtmittel (700s) und dem zweiten Separator (600s) abdichtet;
    wobei der Elektrolyt (810s), die Anode (820s) und die Kathode (830s) eine lagenartige Form aufweisen,
    und wobei das Dichtmittel (700s) so ausgebildet ist, dass es Endabschnitte des Elektrolyten (810s), der Anode (820s) und der Kathode (830s) luftdicht ohne Zwischenräume zwischen dem Dichtmittel (700s) und dem Elektrolyten (810s), zwischen dem Dichtmittel (700s) und der Anode (820s), und zwischen dem Dichtmittel (700s) und der Kathode (830s) umgibt.
  21. Brennstoffzelle nach Anspruch 1, wobei
    die Wasserstoffgaszuführplatte (21n; 860s), die als ein Rückwärtsströmungs-Verhinderungsabschnitt (21n; 860s) fungiert, und einen Vorsprung (21v2t; 21v2ta) auf einer Seite gegenüber der Wasserstoffgas verbrauchenden Fläche aufweist, wobei der Vorsprung (21v2t; 21v2ta) als eine dritte Gasleitung ausgebildet ist.
  22. Brennstoffzelle nach Anspruch 1, wobei
    das Öffnungsverhältnis der Wasserstoffgaszuführplatte (21n; 860s) näherungsweise 1 % oder weniger beträgt.
  23. Fahrzeug, dadurch gekennzeichnet, dass es aufweist:
    die Brennstoffzelle (100n) nach einem der Ansprüche 1 bis 22, und
    einen Antriebsabschnitt (300), der das Fahrzeug (1000) unter Verwendung einer von der Brennstoffzelle (100n) zugeführten Leistung antreibt.
EP08709757.2A 2007-02-05 2008-02-05 Brennstoffzelle und fahrzeug mit brennstoffzelle Not-in-force EP2109910B1 (de)

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PCT/IB2008/000242 WO2008096227A1 (en) 2007-02-05 2008-02-05 Fuel cell and vehicle having fuel cell

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